webadmin : Rebalance status pop up title changed

Popup title changed to "Rebalance Status".

With multiple paragraphs if necessary.

Change-Id: Icac1781f5e256d4ad6c76d80c10af79bdf6a926d
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1014980
Signed-off-by: Anmol Babu <anbabu@redhat.com>